
Mifflin County
- State:
- Pennsylvania
- County Seat:
- Lewistown
Mifflin County's estimated 2025 population is 45,798 with a growth rate of -0.14% in the past year according to the most recent United States census data. Mifflin County is the 47th largest county in Pennsylvania. The 2010 population was 46,638 and has seen a growth of -1.8% since that time.